Algodoo

This contain 3 timers blocks made out of motors and collisions.

Configure the hinge RPM with 60.0 dividing by the number of seconds. e.g. 30.0 RPM should give a period of 2 by 2 seconds.

Timer 0 Action:
Scene.my.t0a = { (action to take here) };

Timer 1 Action:
Scene.my.t1a = { (action to take here) };

Timer 2 Action:
Scene.my.t2a = { (action to take here) };

"Scene.my.t0s", "Scene.my.t1s" and "Scene.my.t2s" hold the states of the timers to prevent multiple triggers, initialize them to "false" if your creating a new scene.

Enjoy it and hope it's useful for your Phun project.